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Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 16759
Experience:  15 years GM master tech
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My check engine light came on. I looked under the car and

Customer Question

My check engine light came on. I looked under the car and there is a plug like wire attached to the exhaust system hanging.
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.

what model Chevy is this ?

where under the track area do you see this hanging plug from and is it not plugged into anything or are the wires cut or ripped out ?

Customer: replied 1 year ago.
All I know is its a 2004 chevy cavalier. It looks to be around half way under the car. It's just hanging not plugged in.
Expert:  Gary replied 1 year ago.

the odds are that is the rear 02 sensor which is located in the exhaust like this picture

it connects up in the rear of the engine compartment near the power steering rack

if the wires are hanging down it became unplugged are the wiring broke and will need a new 02 sensor

most shops can change out a new 02 sensor for 1 hours labor

Customer: replied 1 year ago.
No its not broke. So it should be a sample fix?
Customer: replied 1 year ago.
it looks just like this picture
Expert:  Gary replied 1 year ago.

if it is just unplugged with no damage to the connector you can open the hood and with a good light look down the bottom of the fire wal down where the rack are is and it should plug into a connector in that area

Customer: replied 1 year ago.
Should it be on the left or right side. And near the top or bottom.
Expert:  Gary replied 1 year ago.

more so the drivers side and it can be reached under the car or under the hood through the top reaching down

i wish they listed a picture of it to show you the location

Customer: replied 1 year ago.
Agreed it would be much easier to understand
Expert:  Gary replied 1 year ago.

should be a square connector

Expert:  Gary replied 1 year ago.

you can always get me back through this post for free anytime with any follow up with this question anytime even after you rate us here at Justanswer !